code: def nanmean(
      a: Union[(None, mx.ndarray.NDArray)],
      /,
      *,
      axis: Optional[Union[(int, Tuple[int])]] = None,
      keepdims: bool = False,
      dtype: Optional[None] = None,
      out: Optional[Union[(None, mx.ndarray.NDArray)]] = None,
  ) -> Union[(None, mx.ndarray.NDArray)]:
      raise IvyNotImplementedException()
  
file_path: ivy/ivy/functional/backends/mxnet/experimental/statistical.py
imports: from typing import Union, Optional, Tuple, Sequence
  import mxnet
  from ivy.utils.exceptions import IvyNotImplementedException
label_desc: Use image node_id 3 for calling a global function with example usage: nanmean() without return types